"The earliest fossilized cells scientists have found are about 3.5 billion years old. The fossils are of a type of cyanobacteria, a single-celled life form that makes its own food by photosynthesis. In Greek, cyano- means blue."
Fill in the blanks to complete the passage.
"The earliest fossilized cells scientists have found are about
billion years old. The fossils are of a type of cyanobacteria, a single-celled life form that makes its own food by photosynthesis. In Greek, cyano- means
."
1 answer